There are only a few software/hardware tools available to tune our cars which you can purchase no problem.
TVT are right that you will have to get them from overseas and expect no change from around $10,000 for the hardware, then you will have to get the software, then you will need to invest a good few years learning what a map is and how everything works.
The tuners really are amazing and you cant learn what they know in a few years let alone weeks.

Forget about toys you can buy on ebay as these are a sure fire way to kill your ECU.
Ask some of the technical guys on this forum and they will tell you the same.